The invention discloses an elliptic curve multiplying point operation method and device. The elliptic curve multiplying point operation method comprises ordered multiplying point operation and point addition operation. In the point addition operation, when the fact that a current bit of a scalar K is not 0 is scanned, a true point addition operation is executed; when the fact that the current bitof the scalar K is 0 is scanned, an equivalent point conversion operation is executed; a result of the true point addition operation and a result of the equivalent point conversion operation are stored in a same register file; and the register file comprises a plurality of registers. The elliptic curve multiplying point operation method and device are capable of effectively resisting side channelanalysis and safety error attack.